除虫啉悬浮剂防治蔬菜害虫的试验

５％除虫啉（除虫脲．吡虫啉）悬浮剂对菜蚜、节瓜蓟马、小菜蛾等蔬菜害虫有良好的防治效果，对环境污染小，对人、畜毒性低，是一种高效、广谱、低毒、安全的无公割蔬菜杀虫剂。     

Exposure to Diflubenzuron Results in an Up-Regulation of a Chitin Synthase 1 Gene in Citrus Red Mite,Panonychus citri (Acari: Tetranychidae)

Chitin synthase synthesizes chitin, which is critical for the arthropod exoskeleton. In this study, we cloned the cDNA sequences of a chitin synthase 1 gene, PcCHS1, in the citrus red mite, Panonychus citri (McGregor), which is one of the most economically important pests of citrus worldwide. The full-length cDNA of PcCHS1 contains an open reading frame of 4605 bp of nucleotides, which encodes a protein of 1535 amino acid residues with a predicted molecular mass of 175.0 kDa. A phylogenetic analysis showed that PcCHS1 was most closely related to CHS1 from Tetranychus urticae. During P. citri development, PcCHS1 was constantly expressed in all stages but highly expressed in the egg stage (114.8-fold higher than in the adult). When larvae were exposed to diflubenzuron (DFB) for 6 h, the mite had a significantly high mortality rate, and the mRNA expression levels of PcCHS1 were significantly enhanced. These results indicate a promising use of DFB to control P. citri, by possibly acting as an inhibitor in chitin synthesis as indicated by the up-regulation of PcCHS1 after exposure to DFB.     

除虫脲泡腾片剂制备中的 影响因素及质量检测

选用除虫脲为有效成分制备泡腾片剂。对加药方式、颗粒载药量等技术指标进行了研究。对除虫脲泡腾片剂的物理性状,如pH、湿筛试验、持久起泡性、崩解时间、悬浮率及贮存稳定性进行了测定。结果表明,研制成的除虫脲泡腾片剂达到了“起泡片剂FAO准则编写指南”的要求。     

7.5%除虫·高氯悬浮剂防治甘蓝菜青虫田间药效试验

为验证7.5%除虫·高氯悬浮剂对甘蓝菜青虫防治效果,确定最佳剂量,我们做了田间药效试验,结果表明,7.5%除虫·高氯悬浮剂对甘蓝菜青虫的最佳用量为17￣28ga.i./hm2(有效成分,下同),平均防效在78.1%以上。     

反相高效液相色谱法同时测定复配制剂中的灭幼脲、抗蚜威、三唑酮

利用反相高效液相色谱外标法测定了来幼脲、抗蚜威、三唑酮的含量。方法标准偏差〈０．５,变异系数〈０．５％,回收率９８．０％～１００．０％。     

除虫脲原药的高效液相色谱分析

本文采用高效液相色谱法，使用反相色谱柱和紫外检测器，以邻苯二甲酸二乙酯为内标物，对除虫脲进行液相色谱分离和测定。方法的标准偏差为０．３３，变异系数为０．３９％，除虫脲的回收率在９８．９０￣１０１．７０％之间。     

除虫脲合成的经济性研究

文章用对氯苯基异氰酸酯和2,6-二氟苯甲酰胺反应合成除虫脲,对其合成的经济性进行了研究。文章发现,对氯苯基异氰酸酯和2,6-二氟苯甲酰胺反应的摩尔比在1.1∶1合成的经济性最好。     

除虫脲生产的经济分析

简要介绍了除虫脲的用途、生产过程、消耗定额、产品质量指标 ;对 1 0 0t/a除虫脲 (原料药 )生产线作了经济分析 ,并建议若将环己醇为起始原料改为直接进口中间体 2 ,6 二氯苯甲腈 ,将能大大缩短生产流程及生产周期 ,降低设备投资 ,从而提高经济效益     

二种水基性农药对桔小实蝇的防效

2%阿维菌素水乳剂和5%吡·除悬浮剂对桔小实蝇的防治效果试验显示,2%阿维菌素水乳剂及5%吡·除悬浮剂对防治桔小实蝇都具有良好的效果。而2%阿维菌素水乳剂较5%吡·除悬浮剂为好。两者均具有高效、低毒、与环境相容性好的的特点,是防治桔小实蝇的理想药剂。     

高效液相色谱法定量分析除虫脲

采用反相高效液相色谱法,以C18柱为固定相、甲醇+水为流动相,用DAD检测器在254nm波长下定量测定除虫脲的含量。本方法的变异系数为0.235%,平均回收率为99.92%,线性相关系数为0.9999。